Danfoss VLT AQUA Drive FC 202 Operating Instructions Manual page 44

Electrical Installation
Transformer tap set-up
If the cabinet light and outlet and/or the space heaters
and thermostat are installed, transformer T1 requires its
taps to be set to the proper input voltage. A 380-480/500
V frequency converter is initially set to the 525 V tap and a
525-690 V frequency converters is set to the 690 V tap to
ensure no overvoltage of secondary equipment occurs if
the tap is not changed before applying power. See
Table 4.12 to set the proper tap at terminal T1 located in
4 4
the rectifier cabinet.
Input voltage range [V]
380 V-440
441 V-490
491 V-550
551 V-625
626 V-660
661 V-690
Table 4.12 Transformer Tap Set-up
NAMUR terminals
NAMUR is an international association of automation
technology users in the process industries, primarily
chemical and pharmaceutical industries in Germany.
Selecting this option provides terminals organised and
labeled to the specifications of the NAMUR standard for
frequency converters input and output terminals. This
®
requires VLT
Extended Relay Card MCB 113.
RCD (Residual Current Device)
Uses the core balance method to monitor ground fault
currents in grounded and high-resistance grounded
systems (TN and TT systems in IEC terminology). There is a
pre-warning (50% of main alarm set-point) and a main
alarm set-point. Associated with each set-point is an SPDT
alarm relay for external use. Requires an external "window-
type" current transformer (supplied and installed by the
customer).
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Integrated into the frequency converter safe
torque off circuit
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IEC 60755 Type B device monitors AC, pulsed DC,
and pure DC ground fault currents
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LED bar graph indicator of the ground fault
current level from 10–100% of the set-point
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Fault memory
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TEST/RESET button
Insulation Resistance Monitor (IRM)
Monitors the insulation resistance in ungrounded systems
(IT systems in IEC terminology) between the system phase
conductors and ground. There is an ohmic pre-warning
and a main alarm set-point for the insulation level. An
SPDT alarm relay for external use is associate with each
setpoint.
42
Tap to select [V]
400
460
525
575
660
690
PTC Thermistor Card MCB 112 VLT
Danfoss A/S © Rev. 2014-01-22 All rights reserved.
Operating Instructions
NOTICE
Only one insulation resistance monitor can be connected
to each ungrounded (IT) system.
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IEC emergency stop with Pilz safety relay
Includes a redundant 4-wire emergency-stop push button
mounted on the front of the enclosure and a Pilz relay that
monitors it in conjunction with the frequency converter
STO circuit and the mains contactor located in the options
cabinet.
Manual motor starters
Provide 3-phase power for electric blowers often required
for larger motors. Power for the starters is provided from
the load side of any supplied contactor, circuit breaker, or
disconnect switch. Power is fused before each motor
starter, and is off when the incoming power to the
frequency converters is off. Up to 2 starters are allowed
(one if a 30 A, fuse-protected circuit is ordered), and are
integrated into the frequency converter STO circuit.
Unit features include:
®
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30 A, fuse-protected terminals
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In applications where the motor is used as a brake, energy
is generated in the motor and sent back into the
frequency converter. If the energy cannot be transported
back to the motor, it increases the voltage in the
frequency converter DC line. In applications with frequent
braking and/or high inertia loads, this increase may lead to
an overvoltage trip in the frequency converter and finally a
shut down. Brake resistors are used to dissipate the excess
energy resulting from the regenerative braking. The
resistor is selected based on its ohmic value, its power
dissipation rate and its physical size. Danfoss offers a wide
Integrated into the frequency converter safe
torque off circuit
LCD display of the ohmic value of the insulation
resistance
Fault memory
INFO, TEST, and RESET buttons
Operation switch (on/off)
Short-circuit and overload protection with test
function
Manual reset function
3-phase power matching incoming mains voltage
for powering auxiliary customer equipment
Not available if 2 manual motor starters are
selected
Terminals are off when the incoming power to
the frequency converter is off
Power for the fused protected terminals is
provided from the load side of any supplied
contactor, circuit breaker, or disconnect switch
MG21B202